A direct circulation system is a solar water heating setup where household water flows directly through the solar collectors to absorb heat. A pump circulates water when the collectors are hotter than the tank, making these systems efficient and simple in warm climates without freezing risk.
/dəˈrɛkt ˌsɜr.kjʊˈleɪ.ʃən ˈsɪs.təm/
A direct circulation system is a solar water heating setup where household water flows directly through the solar collectors to absorb heat. A pump circulates water when the collectors are hotter than the tank, making these systems efficient and simple in warm climates without freezing risk.
What is a direct circulation solar system?
It’s a solar water heater where household water circulates directly through collectors to absorb heat.
Source: The Cooling Company
Direct circulation heats household water inside the collectors.
In sunny climates, a homeowner uses direct circulation to heat water with rooftop collectors, reducing utility bills year‑round.
Use a controller that runs the pump only when solar heat gain is strong to maximize savings.
“Use a controller that runs the pump only when solar heat gain is strong to maximize savings.”
Modern controllers make direct circulation systems far more efficient than early solar water heaters.
Can direct circulation systems freeze?
Yes. They are not recommended for climates with freezing temperatures.
Do direct systems need a controller?
Yes. A controller optimizes pump run time based on temperature differences.
Is a backup heater required?
Usually yes, for cloudy days or higher demand.
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